Electronic devices with covering structures

ABSTRACT

Electronic devices such as head-mounted electronic devices may include displays for presenting images to users. To accommodate variations in the interpupillary distances associated with different users, a head-mounted device may have left-eye and right-eye optical modules that move with respect to each other. To hide internal structures from view, the rear of a head-mounted device may be provided with a cover. The cover may have a stretchable layer that is coupled to a frame. Openings in the stretchable layer may be aligned with the optical modules.

This application claims the benefit of provisional patent applicationNo. 63/010,545, filed Apr. 15, 2020, which is hereby incorporated byreference herein in its entirety.

FIELD

This relates generally to electronic devices, and, more particularly, towearable electronic devices such as head-mounted devices.

BACKGROUND

Electronic devices such as head-mounted devices are configured to beworn on a head of a user. A head-mounted device may have left and rightoptical systems for presenting images to a user's left and right eyes.Not all users have the same physical distance separating their eyes. Toaccommodate differences in interpupillary distance between differentusers, a head-mounted device may have a mechanism for adjusting thepositions of the left and right optical systems.

SUMMARY

Electronic devices such as head-mounted electronic devices may includedisplays for presenting images to users. To accommodate variations inthe interpupillary distances associated with different users, ahead-mounted device may have left-eye and right-eye optical modules thatmove with respect to each other. Each optical module may include adisplay device for producing an image and an associated opticalcomponent such as a lens for providing the image to an associated eyebox in which an eye of the user is located for viewing the image. Theoptical modules, which may sometimes be referred to as optical systems,display systems, lens systems, lens and display assemblies, etc., mayeach have a support structure such as a lens barrel that supports arespective display and lens.

Actuators may be used to position the lens barrels within the housing ofa head-mounted device. To hide the actuators and other electricalcomponents such as integrated circuits, batteries, sensors, etc. and tohide potentially unsightly internal housing structures from view, therear of a head-mounted device that faces the user may be provided with acosmetic covering. Openings in the cosmetic covering may receive thelens barrels of the optical modules. The cosmetic covering may beconfigured to accommodate movement in the positions of the opticalmodules for different interpupillary distances.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top view of an illustrative head-mounted device inaccordance with an embodiment.

FIG. 2 is a rear view of an illustrative head-mounted device inaccordance with an embodiment.

FIG. 3 is a schematic diagram of an illustrative head-mounted device inaccordance with an embodiment.

FIG. 4 is a top view of an illustrative head-mounted device in whichleft-eye and right-eye optical modules have been placed close to eachother to accommodate a user with a small interpupillary distance inaccordance with an embodiment.

FIG. 5 is a top view of the illustrative head-mounted device of FIG. 4in which the optical modules have been moved away from each other toaccommodate a user with a large interpupillary distance in accordancewith an embodiment.

FIG. 6 is a cross-sectional side view of an illustrative head-mounteddevice with a fan for promoting air flow to cool internal electricalcomponents in accordance with an embodiment.

FIG. 7 is an exploded perspective view of an illustrative curtain havinga frame and a cover layer that may be supported on the frame inaccordance with an embodiment.

FIG. 8 is a top view of an illustrative optical module and cover layerin accordance with an embodiment.

FIG. 9 is a view of an illustrative cover layer with a peripheralelastic band in accordance with an embodiment.

FIG. 10 is a view of an illustrative cover layer with woven elasticstrands forming a peripheral elastic band in accordance with anembodiment.

FIG. 11 is a diagram showing how a cover layer may be formed from amaterial that stretches in accordance with an embodiment.

FIG. 12 is a view of an illustrative frame for a curtain in accordancewith an embodiment.

FIG. 13 is a cross-sectional side view showing how a cover layer with aperipheral elastic band may move relative to a rigid frame in accordancewith an embodiment.

FIG. 14 is a cross-sectional top view of an illustrative head-mounteddevice with a floating curtain in accordance with an embodiment.

FIG. 15 is a rear view of an illustrative curtain showing locations forattaching the curtain to a head-mounted device housing member inaccordance with an embodiment.

FIG. 16 is a cross-sectional side view of a portion of an illustrativehead-mounted device showing how a curtain may be attached to ahead-mounted device housing member in accordance with an embodiment.

FIG. 17 is a top view of an illustrative apparatus with a movable membersurrounded by a curtain in accordance with an embodiment.

DETAILED DESCRIPTION

An electronic device such as a head-mounted device may have a front facethat faces away from a user's head and may have an opposing rear facethat faces the user's head. Optical modules on the rear face may be usedto provide images to a user's eyes. The positions of the optical modulesmay be adjusted to accommodate different user interpupillary distances.Internal device structures may be hidden from view by the user bycovering the rear face of the device with a curtain. The curtain, whichmay sometimes be referred to as a cover, covering structure, rearhousing cover, rear housing wall, rear housing structure, cosmeticcovering, etc., may help block potentially unsightly internal structuresfrom view, while accommodating movement of the optical modules.

A top view of an illustrative head-mounted device with a curtain isshown in FIG. 1 . As shown in FIG. 1 , head-mounted devices such aselectronic device 10 may have head-mounted support structures such ashousing 12. Housing 12 may include portions (e.g., support structures12T) to allow device 10 to be worn on a user's head. Support structures12T may be formed from fabric, polymer, metal, and/or other material.Support structures 12T may form a strap or other head-mounted supportstructures that help support device 10 on a user's head. A main supportstructure (e.g., main housing portion 12M) of housing 12 may supportelectronic components such as displays 14. Main housing portion 12M mayinclude housing structures formed from metal, polymer, glass, ceramic,and/or other material. For example, housing portion 12M may have housingwalls on front face F and housing walls on adjacent top, bottom, left,and right side faces that are formed from rigid polymer or other rigidsupport structures and these rigid walls may optionally be covered withelectrical components, fabric, leather, or other soft materials, etc.The walls of housing portion 12M may enclose internal components 38 ininterior region 34 of device 10 and may separate interior region 34 fromthe environment surrounding device 10 (exterior region 36). Internalcomponents 38 may include integrated circuits, actuators, batteries,sensors, and/or other circuits and structures for device 10. Housing 12may be configured to be worn on a head of a user and may form glasses, ahat, a helmet, goggles, and/or other head-mounted device. Configurationsin which housing 12 forms goggles may sometimes be described herein asan example.

Front face F of housing 12 may face outwardly away from a user's headand face. Opposing rear face R of housing 12 may face the user. Portionsof housing 12 (e.g., portions of main housing 12M) on rear face R mayform a cover such as curtain 12C. In an illustrative configuration,curtain 12C includes a fabric layer that separates interior region 34from the exterior region to the rear of device 10. Other structures maybe used in forming curtain 12C, if desired. The presence of curtain 12Con rear face R may help hide internal housing structures, internalcomponents 38, and other structures in interior region 34 from view by auser.

Device 10 may have left and right optical modules 40. Each opticalmodule may include a respective display 14, lens 30, and supportstructure 32. Support structures 32, which may sometimes be referred toas lens barrels or optical module support structures, may include hollowcylindrical structures with open ends or other supporting structures tohouse displays 14 and lenses 30. Support structures 32 may, for example,include a left lens barrel that supports a left display 14 and left lens30 and a right lens barrel that supports a right display 14 and rightlens 30. Displays 14 may include arrays of pixels or other displaydevices to produce images. Displays 14 may, for example, include organiclight-emitting diode pixels formed on substrates with thin-filmcircuitry and/or formed on semiconductor substrates, pixels formed fromcrystalline semiconductor dies, liquid crystal display pixels, scanningdisplay devices, and/or other display devices for producing images.Lenses 30 may include one or more lens elements for providing imagelight from displays 14 to respective eyes boxes 13. Lenses may beimplemented using refractive glass lens elements, using mirror lensstructures (catadioptric lenses), using holographic lenses, and/or otherlens systems. When a user's eyes are located in eye boxes 13, displays(display panels) 14 operate together to form a display for device 10(e.g., the images provided by respective left and right optical modules40 may be viewed by the user's eyes in eye boxes 13 so that astereoscopic image is created for the user). The left image from theleft optical module fuses with the right image from a right opticalmodule while the display is viewed by the user.

Not all users have the same interpupillary distance IPD. To providedevice 10 with the ability to adjust the interpupillary spacing betweenmodules 40 along lateral dimension X and thereby adjust the spacing IPDbetween eye boxes 13 to accommodate different user interpupillarydistances, device 10 may be provided with actuators 42. Actuators 42 canbe manually controlled and/or computer-controlled actuators (e.g.,computer-controlled motors) for moving support structures 32 relative toeach other.

As shown in FIG. 2 , curtain 12C may cover rear face F while leavinglenses 30 of optical modules 40 uncovered (e.g., curtain 12C may haveopenings that are aligned with and receive modules 40). As modules 40are moved relative to each other along dimension X to accommodatedifferent interpupillary distances for different users, modules 40 moverelative to fixed housing structures such as the walls of main portion12M and move relative to each other. To prevent undesired wrinkling andbuckling of curtain 12C as optical modules 40 are moved relative torigid portions of housing 12M and relative to each other, a fabric layeror other cover layer in curtain 12C may be configured to slide, stretch,open/close, and/or otherwise adjust to accommodate optical modulemovement.

A schematic diagram of an illustrative electronic device such as ahead-mounted device or other wearable device is shown in FIG. 3 . Device10 of FIG. 3 may be operated as a stand-alone device and/or theresources of device 10 may be used to communicate with externalelectronic equipment. As an example, communications circuitry in device10 may be used to transmit user input information, sensor information,and/or other information to external electronic devices (e.g.,wirelessly or via wired connections). Each of these external devices mayinclude components of the type shown by device 10 of FIG. 3 .

As shown in FIG. 3 , a head-mounted device such as device 10 may includecontrol circuitry 20. Control circuitry 20 may include storage andprocessing circuitry for supporting the operation of device 10. Thestorage and processing circuitry may include storage such as nonvolatilememory (e.g., flash memory or other electrically-programmable-read-onlymemory configured to form a solid state drive), volatile memory (e.g.,static or dynamic random-access-memory), etc. Processing circuitry incontrol circuitry 20 may be used to gather input from sensors and otherinput devices and may be used to control output devices. The processingcircuitry may be based on one or more microprocessors, microcontrollers,digital signal processors, baseband processors and other wirelesscommunications circuits, power management units, audio chips,application specific integrated circuits, etc. During operation, controlcircuitry 20 may use display(s) 14 and other output devices in providinga user with visual output and other output.

To support communications between device 10 and external equipment,control circuitry 20 may communicate using communications circuitry 22.Circuitry 22 may include antennas, radio-frequency transceivercircuitry, and other wireless communications circuitry and/or wiredcommunications circuitry. Circuitry 22, which may sometimes be referredto as control circuitry and/or control and communications circuitry, maysupport bidirectional wireless communications between device 10 andexternal equipment (e.g., a companion device such as a computer,cellular telephone, or other electronic device, an accessory such as apoint device, computer stylus, or other input device, speakers or otheroutput devices, etc.) over a wireless link. For example, circuitry 22may include radio-frequency transceiver circuitry such as wireless localarea network transceiver circuitry configured to support communicationsover a wireless local area network link, near-field communicationstransceiver circuitry configured to support communications over anear-field communications link, cellular telephone transceiver circuitryconfigured to support communications over a cellular telephone link, ortransceiver circuitry configured to support communications over anyother suitable wired or wireless communications link. Wirelesscommunications may, for example, be supported over a Bluetooth® link, aWiFi® link, a wireless link operating at a frequency between 10 GHz and400 GHz, a 60 GHz link, or other millimeter wave link, a cellulartelephone link, or other wireless communications link. Device 10 may, ifdesired, include power circuits for transmitting and/or receiving wiredand/or wireless power and may include batteries or other energy storagedevices. For example, device 10 may include a coil and rectifier toreceive wireless power that is provided to circuitry in device 10.

Device 10 may include input-output devices such as devices 24.Input-output devices 24 may be used in gathering user input, ingathering information on the environment surrounding the user, and/or inproviding a user with output. Devices 24 may include one or moredisplays such as display(s) 14. Display(s) 14 may include one or moredisplay devices such as organic light-emitting diode display panels(panels with organic light-emitting diode pixels formed on polymersubstrates or silicon substrates that contain pixel control circuitry),liquid crystal display panels, microelectromechanical systems displays(e.g., two-dimensional mirror arrays or scanning mirror displaydevices), display panels having pixel arrays formed from crystallinesemiconductor light-emitting diode dies (sometimes referred to asmicroLEDs), and/or other display devices.

Sensors 16 in input-output devices 24 may include force sensors (e.g.,strain gauges, capacitive force sensors, resistive force sensors, etc.),audio sensors such as microphones, touch and/or proximity sensors suchas capacitive sensors such as a touch sensor that forms a button,trackpad, or other input device), and other sensors. If desired, sensors16 may include optical sensors such as optical sensors that emit anddetect light, ultrasonic sensors, optical touch sensors, opticalproximity sensors, and/or other touch sensors and/or proximity sensors,monochromatic and color ambient light sensors, image sensors,fingerprint sensors, iris scanning sensors, retinal scanning sensors,and other biometric sensors, temperature sensors, sensors for measuringthree-dimensional non-contact gestures (“air gestures”), pressuresensors, sensors for detecting position, orientation, and/or motion(e.g., accelerometers, magnetic sensors such as compass sensors,gyroscopes, and/or inertial measurement units that contain some or allof these sensors), health sensors such as blood oxygen sensors, heartrate sensors, blood flow sensors, and/or other health sensors,radio-frequency sensors, depth sensors (e.g., structured light sensorsand/or depth sensors based on stereo imaging devices that capturethree-dimensional images), optical sensors such as self-mixing sensorsand light detection and ranging (lidar) sensors that gathertime-of-flight measurements, humidity sensors, moisture sensors, gazetracking sensors, electromyography sensors to sense muscle activation,facial sensors, and/or other sensors. In some arrangements, device 10may use sensors 16 and/or other input-output devices to gather userinput. For example, buttons may be used to gather button press input,touch sensors overlapping displays can be used for gathering user touchscreen input, touch pads may be used in gathering touch input,microphones may be used for gathering audio input, accelerometers may beused in monitoring when a finger contacts an input surface and maytherefore be used to gather finger press input, etc.

If desired, electronic device 10 may include additional components (see,e.g., other devices 18 in input-output devices 24). The additionalcomponents may include haptic output devices, actuators for movingmovable housing structures, audio output devices such as speakers,light-emitting diodes for status indicators, light sources such aslight-emitting diodes that illuminate portions of a housing and/ordisplay structure, other optical output devices, and/or other circuitryfor gathering input and/or providing output. Device 10 may also includea battery or other energy storage device, connector ports for supportingwired communication with ancillary equipment and for receiving wiredpower, and other circuitry.

FIGS. 4 and 5 are top views of device 10 showing how the optical modulesof device 10 move with respect to each other along lateral dimension Xto accommodate different interpupillary distances IPD (the distancebetween a user's left and right eyes). In the example of FIG. 4 , leftoptical module 40L and right optical module 40R have been moved towardseach other to accommodate a small interpupillary distance. In theexample of FIG. 5 , left optical module 40L and right optical module 40Rhave been moved away from each other to accommodate a largeinterpupillary distance.

Curtain 12C has edge portions such as left portion 12C-L between lefthousing wall 12M-L and left optical module 40L and right portion 12C-Rbetween right housing wall 12M-R and right optical module 40R. Middlepotion 12C-M of curtain 12C extends between left optical module 40L andright optical module 40R. In the configuration of FIG. 4 , opticalmodules 40L and 40R are relatively close to each other, so middleportion 12C-M is relatively small and portions 12C-L and 12C-R arerelatively large. In the configuration of FIG. 5 , optical modules 40Land 40R are relatively far from each other, so left portion 12C-L andright portion 12C-R are shorter along lateral dimension X and middleportion 12C-M has been enlarged relative to the configuration of FIG. 4.

To help accommodate differences in size for curtain 12C (e.g., lengthchanges for portions of curtain 12M along lateral dimension X), curtain12C may include a cover layer formed from a stretchable material such asfabric. The cover layer may be supported by a rigid frame. The fabricmay be provided with a peripheral elastic band that helps allow thefabric to slide relative to the frame while being retained securely onthe frame, thereby further helping curtain 12M to be dynamicallyadjusted without exhibiting undesired buckling and wrinkling.

FIG. 6 is a side view of device 10 showing how device 10 may, ifdesired, include cooling features to help cool display 14 and otherinternal components 38. As shown in FIG. 6 , for example, device 10 mayhave a fan such as fan 50. Fan 50 may be mounted in housing 12 (e.g., afan housing in housing 12, etc.) in a configuration that allows fan 50to expel air from housing 12. To allow cool air to move past the face ofthe user while cooling electrical components in interior region 34 suchas internal components 38 and display 14, curtain 12C may be permeableto air. Curtain 12C may, as an example, have one or moreair-flow-promotion openings. In an illustrative configuration, curtain12C is formed from knit or woven fabric that has a sufficiently looseknit or weave to allow air to flow through the interstitial gaps betweenadjacent strands of material in the fabric (e.g., between warp and weftstrands). Openings may also be formed by laser cutting and/or otheropening formation techniques. In configurations in which curtain 12C ispermeable to air, air may flow into device 10 through curtain 12C, mayflow past display 14 and other internal components 38, and may exitinterior region 34 through fan 50. Air may flow in this way to cooldevice 10 while device 10 is being worn on a head of a user. If desired,housing 12 may have additional openings (e.g., slot shaped openings onan upper wall, side wall, and/or lower wall) that provide additionalpathways for air flow.

To allow a cover layer in curtain 12C to slide back and forth duringadjustments to the positions of modules 40, curtain 12C may be providedwith a rigid frame that supports the cover layer without excessivelyrestricting lateral motion of the cover layer. FIG. 7 is an explodedperspective view of a left-hand portion of an illustrative curtain. Asshown in FIG. 7 , curtain 12C may include frame 12CF and cover layer12CC. Cover layer 12CC may have left and right openings such as lensbarrel opening 52 to receive respective left and right optical modules40. Frame 12CF may have corresponding left and right openings such asillustrative opening 54. Opening 54 may be larger than opening 52 toaccommodate lateral movement of module 40. When mounted in device 10,cover layer 12CC may be attached to frame 12CF so that cover layer 12CCcan stretch and/or slide relative to frame 12CF.

If desired, cover layer 12CC may include multiple layers of material. Asshown in the top view of FIG. 8 , for example, cover layer 12CC may,include outer layer 56 and inner layer 58. Outer layer 56 may be, forexample, a fabric layer. Inner layer 58 may be, for example, a layer offabric formed form polymer strands that have been thermally formed intoan accordion shape. In this type of arrangement, outer layer 56 may be afabric with a desired visual appearance, whereas inner layer 58 may be afabric or other layer that provides cover layer 12CC with a desiredopacity to help block internal device components from view. Layer 12CCmay be attached to module 40 using attachment structures 60. Structures60 may include retention rings, screws and other fasteners, clips, andother structures that mechanically attach layer 12CC to supportstructures 32 of module 40 and/or may include adhesive for attachinglayer 12CC to module 40.

If desired, layer 12CC may be provided with a peripheral elastic band.This type of arrangement is shown in FIG. 9 . As shown in FIG. 9 , coverlayer 12CC may have fabric 62 and peripheral elastic band 64. Fabric 62may be warp knit fabric, weft knit fabric, or other knit fabric (e.g.,to promote stretchiness), may be woven fabric, braided fabric, non-wovenfabric, etc. If desired, a layer of stretchy plastic may be attached tofabric 62 and/or an elastomeric polymer layer may be used in place ofsome or all of fabric 62 in forming layer 12CC. Fabric 62 may be formedfrom interlaced (intertwined) strands of material such as polymerstrands, strands of cotton or other natural material, syntheticmaterial, and/or other materials. The strands in fabric 62 may includemonofilament strands and/or multi-filament strands. In an illustrativeconfiguration, some of the strands of fabric 62 may be selected toprovide fabric 62 with strength, whereas other strands in fabric 62 maybe formed from elastomeric material that enhances the ability of fabric62 to stretch (and that has a lower elastic modulus than the strandsthat provide fabric 62 with strength). Examples of stretchable strandmaterials include elastomeric materials such as silicone andthermoplastic polyurethane (TPU). Examples of strength-enhancing strandmaterials include polyester, nylon, etc. Elastic band 64 may be formedfrom a strand of elastomeric material such as a strand of silicone orthermoplastic polyurethane or other stretchable material. Othermaterials may be used in forming the strands in fabric 62, if desired.

Elastic band 64 may be attached to along the outer edge of fabric 62 bysewing, by knitting band 64 into a knit fabric, using adhesive, usingcrimped connections or other fasteners, and/or by otherwise attachingband 64 to the periphery of fabric 62. If desired, band 64 may be formedfrom warp strands and weft strands in a woven fabric (see, e.g., band 64of fabric 62 of FIG. 10 ).

The fabric or other material forming cover layer 12CC may bestretchable. As shown in FIG. 11 , for example, layer 12CC may beconfigured to be stretched without damage from a first shapecharacterized by length L1 along dimension X to a second larger shapecharacterized by length L2 along dimension X. The amount of stretching(L2/L1) that layer 12CC may accommodate may be, for example, at least50%, at least 75%, at least 100%, or at least 150%.

When attaching cover layer 12CC to frame 12CF, band 64 may fit over theoutside of frame 12CF. Band 64 may then tug inwardly on the portions ofcover layer 12CC that overlap the edges of the frame. This, in turn,will help to tension the main portion of layer 12CC outwardly (e.g., inlateral dimensions X and Y), thereby ensuring that cover layer 12CC willremain taut. At the same time, there may be at least some allowedlateral slippage of layer 12CC back and forth as needed to accommodatechanges in the positions of modules 40.

An illustrative shape for frame 12CF of curtain 12C is shown in FIG. 12. As shown in FIG. 12 , frame 12CF may have left and right openings 54to overlap the desired range of positions achievable by modules 40.Frame 12CF may have an outer ring-shaped portion 66 bridged in theportion of frame 12CF that overlaps the user's nose by bridging middleportion 68. Openings 54 may be rectangular, oval, teardrop shaped,circular, and/or may have other suitable shapes.

FIG. 13 shows how elastic band 64 may help provide fabric 62 of cover12CC with the ability to slide laterally relative to frame toaccommodate movement in optical modules 40 while helping to keep fabric62 taut. Elastic band 64 is normally in a stretched state. As a result,band 64 attempts to contract and, in doing so, tends to pull fabric 62around frame 12CF in direction 74. On the inner side of frame 12CF, thetightening force from band 64 is therefore normally pulling fabric 62 indirection 76, whereas on the opposing outer (rear-facing) side of frame12CF, the tightening force of band 64 tends to pull fabric 62 towardsthe periphery of frame 12CF in direction 78. The presence of band 64therefore helps tighten fabric 62 and prevent wrinkles in cover layer12CC.

When it is desired to move optical module 40, fabric 62 can slide backand forth over frame 12CF as needed. Consider, as an example, a scenarioin which module 40 is moved in direction 70. This pulls fabric 62 on theouter side of frame 12CF (e.g., frame portion 66) in direction 80. Onthe inner side of frame 12CF, the edge of fabric 62 is pulled indirection 72, causing band 64 to stretch and expand slightly (e.g., sothat band 64 moves to position 64′). Due to the pull on fabric 62 indirection 80, fabric 62 slides around frame 12CF and across the outersurface of frame 12CF in direction 82, thereby helping to accommodatemovement of module 40 without wrinkling cover layer 12CC.

To facilitate sliding movement of cover 12CC around the edges of frame12CF in this way, at least the left and right edges of cover 12CC (andadjacent portions along the upper and lower edges of cover 12CC) may notbe fixedly attached to frame 12CF or housing 12. An illustrativeconfiguration for mounting curtain 12C within housing portion 12M ofhousing 12 of device 10 is shown in FIG. 14 . In the example of FIG. 14, housing portion 12M has a central support such as housing structure84. Curtain 12C may be fixedly attached to structure 84 using attachmentmechanism 86. Mechanism 86 may include, for example, glue and/ormechanical structures that grip fabric 62 and/or other portions ofcurtain 12C to hold curtain 12C firmly in place within device 10.Mechanism 86 may, if desired, include engagement structures (e.g., snapfeatures) that allow curtain 12C to be removed and replaced with anothercurtain. When mounted in device 10, however, mechanism 86 will holdcurtain 12C securely.

As shown in FIG. 14 , device 10 may, if desired, have a ring-shapedopaque light seal such as light seal 90. Light seal 90 may be configuredto be removable (e.g. so that light seal 90 may be replaced when worn).Foam or other soft materials may be used in forming light seal 90.

The attachment structures used in mechanism 86 of FIG. 14 may or may notpermit fabric 62 to slide freely with respect to frame 12CF. To permitfabric 62 to slide freely with respect to frame 12CF of curtain 12Celsewhere in curtain 12C (e.g., at the left and right edges of curtain12C and at other portions of curtain 12C away from attachment mechanism86), curtain 12C may float with respect to housing 12M (except atattachment mechanism 86). As an example, the opposing ends of curtain12C at the left and right edges of curtain 12C may be separated fromnearby portions of housing portion 12M by air gaps 88. This prevents thefabric of layer 12CC from becoming caught between frame 12CF and housing12. FIG. 15 shows how attachment structures 86 may, if desired, be usedto couple a bridging central portion of frame 12CF such as portion 68 tohousing structure 84 in the center of frame 12CF (e.g., along the upperand lower edges of curtain 12C).

FIG. 16 is a cross-sectional view of curtain 12C showing how attachmentmechanism 86 for attaching curtain 12 to housing structure 84 mayinclude trim member 94. Adhesive 92 may be used to attach fabric 62 andframe 12CF to trim member 94 (e.g., in the vicinity of attachmentmechanism 86 in the areas of curtain 12C that overlap bridging portion86 of frame 12CF). Trim member 94 and housing structure 84 may havemating engagement structures. For example, trim member 94 may have asnap such as snap 96 that mates with a corresponding hook such as hook98 on housing structure 84. When it is desired to snap curtain 12C inplace, curtain 12C may be pressed into housing 12M in the −Z direction.If desired, curtain 12C may be removed by disengaging (e.g., unsnapping)the engagement structures (e.g., when it is desired to remove or replacecurtain 12C).

If desired, curtain 12C may be used in equipment other than devices 10.Consider, as an example, the arrangement of FIG. 17 . As shown in FIG.17 , apparatus 100 may have a movable member such as movable member 102.Apparatus 100 may be, for example, a joystick or automobile stick shiftand movable member 102 may be a movable shaft. Movable member 102 maymove in one or more directions 104. Curtain 12C may have a cover layer12CC formed from fabric 62 or other covering material and may haveperipheral elastic band 64. Cover layer 12CC may be mounted over a framesuch as frame 12CF. This allows cover layer 12CC to slip and/or stretchduring movement of member 102 to help avoid wrinkling in curtain 12C.

As described above, one aspect of the present technology is thegathering and use of information such as information from input-outputdevices. The present disclosure contemplates that in some instances,data may be gathered that includes personal information data thatuniquely identifies or can be used to contact or locate a specificperson. Such personal information data can include demographic data,location-based data, telephone numbers, email addresses, twitter ID's,home addresses, data or records relating to a user's health or level offitness (e.g., vital signs measurements, medication information,exercise information), date of birth, username, password, biometricinformation, or any other identifying or personal information.

The present disclosure recognizes that the use of such personalinformation, in the present technology, can be used to the benefit ofusers. For example, the personal information data can be used to delivertargeted content that is of greater interest to the user. Accordingly,use of such personal information data enables users to calculatedcontrol of the delivered content. Further, other uses for personalinformation data that benefit the user are also contemplated by thepresent disclosure. For instance, health and fitness data may be used toprovide insights into a user's general wellness, or may be used aspositive feedback to individuals using technology to pursue wellnessgoals.

The present disclosure contemplates that the entities responsible forthe collection, analysis, disclosure, transfer, storage, or other use ofsuch personal information data will comply with well-established privacypolicies and/or privacy practices. In particular, such entities shouldimplement and consistently use privacy policies and practices that aregenerally recognized as meeting or exceeding industry or governmentalrequirements for maintaining personal information data private andsecure. Such policies should be easily accessible by users, and shouldbe updated as the collection and/or use of data changes. Personalinformation from users should be collected for legitimate and reasonableuses of the entity and not shared or sold outside of those legitimateuses. Further, such collection/sharing should occur after receiving theinformed consent of the users. Additionally, such entities shouldconsider taking any needed steps for safeguarding and securing access tosuch personal information data and ensuring that others with access tothe personal information data adhere to their privacy policies andprocedures. Further, such entities can subject themselves to evaluationby third parties to certify their adherence to widely accepted privacypolicies and practices. In addition, policies and practices should beadapted for the particular types of personal information data beingcollected and/or accessed and adapted to applicable laws and standards,including jurisdiction-specific considerations. For instance, in theUnited States, collection of or access to certain health data may begoverned by federal and/or state laws, such as the Health InsurancePortability and Accountability Act (HIPAA), whereas health data in othercountries may be subject to other regulations and policies and should behandled accordingly. Hence different privacy practices should bemaintained for different personal data types in each country.

Despite the foregoing, the present disclosure also contemplatesembodiments in which users selectively block the use of, or access to,personal information data. That is, the present disclosure contemplatesthat hardware and/or software elements can be provided to prevent orblock access to such personal information data. For example, the presenttechnology can be configured to allow users to select to “opt in” or“opt out” of participation in the collection of personal informationdata during registration for services or anytime thereafter. In anotherexample, users can select not to provide certain types of user data. Inyet another example, users can select to limit the length of timeuser-specific data is maintained. In addition to providing “opt in” and“opt out” options, the present disclosure contemplates providingnotifications relating to the access or use of personal information. Forinstance, a user may be notified upon downloading an application (“app”)that their personal information data will be accessed and then remindedagain just before personal information data is accessed by the app.

Moreover, it is the intent of the present disclosure that personalinformation data should be managed and handled in a way to minimizerisks of unintentional or unauthorized access or use. Risk can beminimized by limiting the collection of data and deleting data once itis no longer needed. In addition, and when applicable, including incertain health related applications, data de-identification can be usedto protect a user's privacy. De-identification may be facilitated, whenappropriate, by removing specific identifiers (e.g., date of birth,etc.), controlling the amount or specificity of data stored (e.g.,collecting location data at a city level rather than at an addresslevel), controlling how data is stored (e.g., aggregating data acrossusers), and/or other methods.

Therefore, although the present disclosure broadly covers use ofinformation that may include personal information data to implement oneor more various disclosed embodiments, the present disclosure alsocontemplates that the various embodiments can also be implementedwithout the need for accessing personal information data. That is, thevarious embodiments of the present technology are not renderedinoperable due to the lack of all or a portion of such personalinformation data.

Physical environment: A physical environment refers to a physical worldthat people can sense and/or interact with without aid of electronicsystems. Physical environments, such as a physical park, includephysical articles, such as physical trees, physical buildings, andphysical people. People can directly sense and/or interact with thephysical environment, such as through sight, touch, hearing, taste, andsmell.

Computer-generated reality: in contrast, a computer-generated reality(CGR) environment refers to a wholly or partially simulated environmentthat people sense and/or interact with via an electronic system. In CGR,a subset of a person's physical motions, or representations thereof, aretracked, and, in response, one or more characteristics of one or morevirtual objects simulated in the CGR environment are adjusted in amanner that comports with at least one law of physics. For example, aCGR system may detect a person's head turning and, in response, adjustgraphical content and an acoustic field presented to the person in amanner similar to how such views and sounds would change in a physicalenvironment. In some situations (e.g., for accessibility reasons),adjustments to characteristic(s) of virtual object(s) in a CGRenvironment may be made in response to representations of physicalmotions (e.g., vocal commands). A person may sense and/or interact witha CGR object using any one of their senses, including sight, sound,touch, taste, and smell. For example, a person may sense and/or interactwith audio objects that create 3D or spatial audio environment thatprovides the perception of point audio sources in 3D space. In anotherexample, audio objects may enable audio transparency, which selectivelyincorporates ambient sounds from the physical environment with orwithout computer-generated audio. In some CGR environments, a person maysense and/or interact only with audio objects. Examples of CGR includevirtual reality and mixed reality.

Virtual reality: A virtual reality (VR) environment refers to asimulated environment that is designed to be based entirely oncomputer-generated sensory inputs for one or more senses. A VRenvironment comprises a plurality of virtual objects with which a personmay sense and/or interact. For example, computer-generated imagery oftrees, buildings, and avatars representing people are examples ofvirtual objects. A person may sense and/or interact with virtual objectsin the VR environment through a simulation of the person's presencewithin the computer-generated environment, and/or through a simulationof a subset of the person's physical movements within thecomputer-generated environment.

Mixed reality: In contrast to a VR environment, which is designed to bebased entirely on computer-generated sensory inputs, a mixed reality(MR) environment refers to a simulated environment that is designed toincorporate sensory inputs from the physical environment, or arepresentation thereof, in addition to including computer-generatedsensory inputs (e.g., virtual objects). On a virtuality continuum, amixed reality environment is anywhere between, but not including, awholly physical environment at one end and virtual reality environmentat the other end. In some MR environments, computer-generated sensoryinputs may respond to changes in sensory inputs from the physicalenvironment. Also, some electronic systems for presenting an MRenvironment may track location and/or orientation with respect to thephysical environment to enable virtual objects to interact with realobjects (that is, physical articles from the physical environment orrepresentations thereof). For example, a system may account formovements so that a virtual tree appears stationery with respect to thephysical ground. Examples of mixed realities include augmented realityand augmented virtuality. Augmented reality: an augmented reality (AR)environment refers to a simulated environment in which one or morevirtual objects are superimposed over a physical environment, or arepresentation thereof. For example, an electronic system for presentingan AR environment may have a transparent or translucent display throughwhich a person may directly view the physical environment. The systemmay be configured to present virtual objects on the transparent ortranslucent display, so that a person, using the system, perceives thevirtual objects superimposed over the physical environment.Alternatively, a system may have an opaque display and one or moreimaging sensors that capture images or video of the physicalenvironment, which are representations of the physical environment. Thesystem composites the images or video with virtual objects, and presentsthe composition on the opaque display. A person, using the system,indirectly views the physical environment by way of the images or videoof the physical environment, and perceives the virtual objectssuperimposed over the physical environment. As used herein, a video ofthe physical environment shown on an opaque display is called“pass-through video,” meaning a system uses one or more image sensor(s)to capture images of the physical environment, and uses those images inpresenting the AR environment on the opaque display. Furtheralternatively, a system may have a projection system that projectsvirtual objects into the physical environment, for example, as ahologram or on a physical surface, so that a person, using the system,perceives the virtual objects superimposed over the physicalenvironment. An augmented reality environment also refers to a simulatedenvironment in which a representation of a physical environment istransformed by computer-generated sensory information. For example, inproviding pass-through video, a system may transform one or more sensorimages to impose a select perspective (e.g., viewpoint) different thanthe perspective captured by the imaging sensors. As another example, arepresentation of a physical environment may be transformed bygraphically modifying (e.g., enlarging) portions thereof, such that themodified portion may be representative but not photorealistic versionsof the originally captured images. As a further example, arepresentation of a physical environment may be transformed bygraphically eliminating or obfuscating portions thereof. Augmentedvirtuality: an augmented virtuality (AV) environment refers to asimulated environment in which a virtual or computer generatedenvironment incorporates one or more sensory inputs from the physicalenvironment. The sensory inputs may be representations of one or morecharacteristics of the physical environment. For example, an AV park mayhave virtual trees and virtual buildings, but people with facesphotorealistically reproduced from images taken of physical people. Asanother example, a virtual object may adopt a shape or color of aphysical article imaged by one or more imaging sensors. As a furtherexample, a virtual object may adopt shadows consistent with the positionof the sun in the physical environment.

Hardware: there are many different types of electronic systems thatenable a person to sense and/or interact with various CGR environments.Examples include head mounted systems, projection-based systems,heads-up displays (HUDs), vehicle windshields having integrated displaycapability, windows having integrated display capability, displaysformed as lenses designed to be placed on a person's eyes (e.g., similarto contact lenses), headphones/earphones, speaker arrays, input systems(e.g., wearable or handheld controllers with or without hapticfeedback), smartphones, tablets, and desktop/laptop computers. A headmounted system may have one or more speaker(s) and an integrated opaquedisplay. Alternatively, a head mounted system may be configured toaccept an external opaque display (e.g., a smartphone). The head mountedsystem may incorporate one or more imaging sensors to capture images orvideo of the physical environment, and/or one or more microphones tocapture audio of the physical environment. Rather than an opaquedisplay, a head mounted system may have a transparent or translucentdisplay. The transparent or translucent display may have a mediumthrough which light representative of images is directed to a person'seyes. The display may utilize digital light projection, OLEDs, LEDs,μLEDs, liquid crystal on silicon, laser scanning light sources, or anycombination of these technologies. The medium may be an opticalwaveguide, a hologram medium, an optical combiner, an optical reflector,or any combination thereof. In one embodiment, the transparent ortranslucent display may be configured to become opaque selectively.Projection-based systems may employ retinal projection technology thatprojects graphical images onto a person's retina. Projection systemsalso may be configured to project virtual objects into the physicalenvironment, for example, as a hologram or on a physical surface.

The foregoing is merely illustrative and various modifications can bemade to the described embodiments. The foregoing embodiments may beimplemented individually or in any combination.

What is claimed is:
 1. A head-mounted device, comprising: a housingseparating an interior region from an exterior region that surrounds thehousing; first and second optical modules in the housing that areconfigured to provide images respectively to first and second eye boxes;and a cover configured to block the interior region from view, whereinthe cover comprises fabric, a frame, and first and second cover openingsthat are respectively aligned with the first and second optical modules,wherein the fabric has a peripheral edge that is coupled to the framewhile allowing the fabric to slide relative to the frame in response tomovement of the first optical module relative to the second opticalmodule.
 2. The head-mounted device defined in claim 1 wherein the framehas first and second frame openings that respectively overlap the firstand second optical modules, wherein the cover comprises an elastic bandrunning around the peripheral edge of the fabric, and wherein theelastic band holds the fabric to the frame while allowing the fabric toslide relative to the frame.
 3. The head-mounted device defined in claim2 further comprising a fan in the housing, wherein the fan is configuredto draw air into the interior region through the fabric.
 4. Thehead-mounted device defined in claim 2 wherein the frame has aperipheral ring-shaped portion bridged by a bridging central portion andwherein the cover is attached to a structure in the housing at thebridging central portion while allowing other portions of the cover tofloat with respect to the housing.
 5. The head-mounted device defined inclaim 1 wherein the fabric comprises stretchable fabric.
 6. Thehead-mounted device defined in claim 5 wherein the fabric comprisesfirst strands of a first elastic modulus and second strands of a secondelastic modulus that is greater than the first elastic modulus.
 7. Thehead-mounted device defined in claim 1 wherein the cover is removablyattached to the housing.
 8. The head-mounted device defined in claim 1wherein the fabric comprises a stretchable air permeable opaque layer.9. The head-mounted device defined in claim 1 wherein each of the firstand second optical modules has a respective display and lens secured ina lens barrel, the head-mounted device further comprising actuatorsconfigured to laterally move the lens barrels relative to the housingwhile the cover stretches to accommodate the lateral movement of thelens barrels and maintain alignment of the first and second coveropenings with the first and second optical modules, respectively. 10.The head-mounted device defined in claim 9 wherein the fabric isconfigured to stretch by at least 50% without failure.
 11. Thehead-mounted device defined in claim 1 wherein the fabric comprises astretchable layer wherein the first and second cover openings are formedin the stretchable layer.
 12. A head-mounted device, comprising: ahousing; left and right optical modules supported by the housing,wherein the left optical module has a left display and left lensconfigured to provide a left image to a left eye box, wherein the rightoptical module has a right display and a right lens configured toprovide a right image to a right eye box, and wherein the left and rightoptical modules are configured to move relative to each other; and acover that has a frame, fabric, a left opening that is aligned with theleft optical module, and a right opening that is aligned with the rightoptical module, wherein the cover is configured to block an interiorregion of the housing from view, and wherein the fabric has a peripheraledge that is coupled to the frame while allowing the fabric to sliderelative to the frame in response to movement of the right and leftoptical modules with respect to each other to accommodate differentinterpupillary distances.
 13. The head-mounted device defined in claim12 wherein the left and right openings are formed in the fabric.
 14. Thehead-mounted device defined in claim 13 wherein the frame has aring-shaped peripheral portion bridged by a central bridging portion andhas first and second frame openings that overlap the left and rightopenings of the fabric.
 15. The head-mounted device defined in claim 14wherein the fabric is attached to the frame with adhesive in the centralbridging portion and is configured to slide relative to other portionsof the frame.
 16. The head-mounted device defined in claim 15 wherein anarea of the ring-shaped peripheral portion is separated from the housingby an air gap to prevent the fabric from becoming caught between theframe and the housing as the fabric slides.
 17. The head-mounted devicedefined in claim 12 wherein the fabric is configured to remain taut asthe right and left optical modules are moved with respect to each other.18. A head-mounted device, comprising: a housing; a strap coupled to thehousing; left and right optical modules supported by the housing,wherein the left optical module has a left display and left lensconfigured to provide a left image to a left eye box, wherein the rightoptical module has a right display and a right lens configured toprovide a right image to a right eye box, and wherein the left and rightoptical modules are configured to move relative to each other; and acover that has a fabric layer coupled to a frame, wherein the fabriclayer extends across a rear face of the housing and blocks an interiorregion of the housing from view, wherein the fabric layer has a leftopening that is aligned with the left optical module and a right openingthat is aligned with the right optical module, and wherein the fabriclayer has a peripheral edge that is coupled to the frame while allowingthe fabric to slide relative to the frame in response to movement of theright and left optical modules with respect to each other to accommodatedifferent interpupillary distances.